【摘要】 为了分析高台基古建筑木结构的抗震性能,以西安鼓楼为例,分别建立鼓楼的高台基、上部木结构、整体结构的三维有限元模型。通过模态分析,分别获取了它们的主要频率和振型;通过对上部木结构和整体结构模型输入El Centro波、Taft波、兰州波三种地震激励,分析了柱顶节点的地震响应;并对这些有限元分析结果进行了对比。结果表明:高台基对上部木结构的高阶频率影响较大,并使上部木结构的地震响应放大,因此,分析高台基古建筑木结构的抗震性能时必须考虑高台基的影响。更多还原

【Abstract】 In order to study the seismic performance of the ancient timber building on high-platform base,the 3D finite element model of Xi’an drum-tower,in cluding high-platform base,upper timber structure and whole structure,is established in this paper.By modal analysis,main frequencies and vibration modes are obtained.Three kinds of earthquake excitations,which are El Centro record,Taft record and Lanzhou record are chosen as input excitations on the upper timber structure model and the whole structure model,and the seismic responses of the nodes at the tops of columns are analyzed.The results of the finite element analysis are compared.Test results show that the high-platform base influences the high frequencies of the structure and enlarges the seismic responses of the upper timber structure.So it must take the influence of the high-platform base into account,when the seismic performance of the ancient timber building on high-platform base is analyzed.更多还原